PIC16F877A-I/ML Microchip Technology, PIC16F877A-I/ML Datasheet - Page 44

• Manufacturer Part Number: PIC16F877A-I/ML
• Description: IC MCU FLASH 8KX14 A/D 44QFN
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877A-I/ML

• Core Size: 8-Bit
• Program Memory Size: 14KB (8K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-QFN
• Controller Family/series: PIC16F
• No. Of I/o's: 33
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 368Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 368 B
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163022, DV164120
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44QFN2 - SOCKET TRAN ICE 44QFN/40DIPAC164322 - MODULE SOCKET MPLAB PM3 28/44QFN444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / Rohs Status: Details

PICmicro MID-RANGE MCU FAMILY
DS31002A-page 2-14
Figure 2-7
and OSCCAL = 70h), and the changes achievable by the OSCCAL register.
Figure 2-7: Ideal Internal RC Oscillator Frequency vs. OSCCAL Register Value
Figure 2-8
frequency can corrected to 4 MHz. These bits can be considered the fine trimming of the
frequency. Sometimes the device frequency at the uncalibrated point cannot be corrected to 4
MHz by the fine trimming of the CAL3:CAL0 bits value. Therefore two additional bits are available
which give a large frequency offset (positive and negative) to move the frequency within the
range where the fine trimming can work. These bits are the CALSLW and CALFST bits, which
offset the internal RC frequency. The action of these bits are shown in
Figure
Figure 2-8: CAL3:CAL0 Trimming of Internal RC Oscillator Frequency Offset
Frequency
4 MHz
4 MHz
(@ 5V, 25˚C)
2-10.
(slowest frequency)
shows the possible device frequencies from the uncalibrated point (at V
shows an example of a device where by selecting one of the CAL3:CAL0 values, the
> 4 MHz
< 4 MHz
CAL3:CAL0 = 0h
CALFST = 0
CALSLW = 1
1.5%
CAL3:CAL0 = 0000
CAL3:CAL0 = 0h
CALFST = 0
CALSLW = 0
One of the 16 possible calibration points
CAL3:CAL0 = 07h
CALFST = 0
CALSLW = 0
CAL3:CAL0
Trim Window
CAL3:CAL0
Trim Window
CAL3:CAL0 = Fh
CALFST = 0
CALSLW = 0
1997 Microchip Technology Inc.
CAL3:CAL0 = 1111
(fastest frequency)
CAL3:CAL0 = Fh
CALFST = 1
CALSLW = x
See X-axis
Internal RC
Frequency at
device reset
CALFST = 0
CALFLW = 0
CAL3:CAL0 = 7h
Figure
DD
= 5V, 25 C,
2-9, and